Specimen ID | State | County | Locality | Year |
| Drainage name | Status |
747265
| OR | Clackamas | WILLAMETTE R. 10000 M UPSTREAM OF I-5 BRIDGE TO 7500 M DOWNSTREAM OF MOLLALA RIVER ST | 1998 |
17090007
| Middle Willamette | established |
40415
| OR | Linn | Willamette River at Albany | 1886 |
17090003
| Upper Willamette | failed |
40414
| OR | Multnomah | Willamette River at Portland | 1885 |
17090012
| Lower Willamette | established |
268375
| OR | Multnomah | Willamette River, confluence with Columbia River | 1935 |
17090012
| Lower Willamette | established |